ArduinoJson 6.13.0 * Added support for custom writer/reader classes (issue #1088) * Added conversion from `JsonArray` and `JsonObject` to `bool`, to be consistent with `JsonVariant` * Fixed `deserializeJson()` when input contains duplicate keys (issue #1095) * Improved `deserializeMsgPack()` speed by reading several bytes at once * Added detection of Atmel AVR8/GNU C Compiler (issue #1112) * Fixed deserializer that stopped reading at the first `0xFF` (PR #1118 by @mikee47) * Fixed dangling reference in copies of `MemberProxy` and `ElementProxy` (issue #1120)